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#include "fdiskP.h"
struct fdisk_context *fdisk_new_context(void)
{
struct fdisk_context *cxt;
size_t i;
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
return NULL;
DBG(LABEL, dbgprint("new context %p allocated", cxt));
cxt->dev_fd = -1;
/*
* Allocate label specific structs.
*
* This is necessary (for example) to store label specific
* context setting.
*/
cxt->labels[ cxt->nlabels++ ] = fdisk_new_gpt_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_dos_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_aix_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_bsd_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_mac_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sgi_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sun_label(cxt);
DBG(CONTEXT, dbgprint("supported labels:"));
for (i = 0; i < cxt->nlabels; i++) {
DBG(CONTEXT, dbgprint(" %s", cxt->labels[i]->name));
cxt->labels[i]->cxt = cxt;
}
return cxt;
}
struct fdisk_label *fdisk_context_get_label(struct fdisk_context *cxt, const char *name)
{
size_t i;
assert(cxt);
for (i = 0; i < cxt->nlabels; i++)
if (strcmp(cxt->labels[i]->name, name) == 0)
return cxt->labels[i];
DBG(LABEL, dbgprint("failed to found %s label driver\n", name));
return NULL;
}
static void reset_context(struct fdisk_context *cxt)
{
size_t nlbs;
struct fdisk_label *lbs[ ARRAY_SIZE(cxt->labels) ];
DBG(CONTEXT, dbgprint("\n-----\nresetting context %p", cxt));
fdisk_deinit_label(cxt); /* reset the current label */
/* remember permanent setting */
memcpy(lbs, cxt->labels, sizeof(lbs));
nlbs = cxt->nlabels;
/* free device specific stuff */
if (cxt->dev_fd > -1)
close(cxt->dev_fd);
free(cxt->dev_path);
free(cxt->firstsector);
/* the reset */
memset(cxt, 0, sizeof(*cxt));
/* initialize */
cxt->dev_fd = -1;
/* set permanent setting */
memcpy(cxt->labels, lbs, sizeof(lbs));
cxt->nlabels = nlbs;
}
/**
* fdisk_context_assign_device:
* @fname: path to the device to be handled
* @readonly: how to open the device
*
* If the @readonly flag is set to false, fdisk will attempt to open
* the device with read-write mode and will fallback to read-only if
* unsuccessful.
*
* Returns: 0 on sucess, < 0 on error.
*/
int fdisk_context_assign_device(struct fdisk_context *cxt,
const char *fname, int readonly)
{
int fd;
DBG(CONTEXT, dbgprint("assigning device %s", fname));
assert(cxt);
reset_context(cxt);
if (readonly == 1 || (fd = open(fname, O_RDWR)) < 0) {
if ((fd = open(fname, O_RDONLY)) < 0)
return -errno;
readonly = 1;
}
cxt->dev_fd = fd;
cxt->dev_path = strdup(fname);
if (!cxt->dev_path)
goto fail;
fdisk_discover_topology(cxt);
fdisk_discover_geometry(cxt);
if (fdisk_read_firstsector(cxt) < 0)
goto fail;
/* detect labels and apply labes specific stuff (e.g geomery)
* to the context */
fdisk_probe_labels(cxt);
fdisk_reset_alignment(cxt);
DBG(CONTEXT, dbgprint("context %p initialized for %s [%s]",
cxt, fname,
readonly ? "READ-ONLY" : "READ-WRITE"));
return 0;
fail:
DBG(CONTEXT, dbgprint("failed to assign device"));
return -errno;
}
/**
* fdisk_free_context:
* @cxt: fdisk context
*
* Deallocates context struct.
*/
void fdisk_free_context(struct fdisk_context *cxt)
{
int i;
if (!cxt)
return;
DBG(CONTEXT, dbgprint("freeing context %p for %s", cxt, cxt->dev_path));
reset_context(cxt);
/* deallocate label's private stuff */
for (i = 0; i < cxt->nlabels; i++) {
if (!cxt->labels[i])
continue;
if (cxt->labels[i]->op->free)
cxt->labels[i]->op->free(cxt->labels[i]);
else
free(cxt->labels[i]);
}
free(cxt);
}
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